土壌汚染対策法ガイドライン第１編：土壌汚染対策法に基づく調査及び措置に関するガイドライン（改訂第３版）（修正版）

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(1)土壌汚染対策法ガイドライン第１編. 土壌汚染対策法に基づく調査及び措置に関するガイドライン（改訂第３版）. 平成 31 年３月環境省水・大気環境局土壌環境課.

(2) 本ガイドラインの策定経緯・位置付け土壌汚染に係る調査及び措置については、土壌汚染対策法（平成 14 年法律第 53 号）及びこれに基づく関係法令に規定されているところです。平成 31 年４月１日より、土壌汚染対策法の一部を改正する法律（平成 29 年法律第 33 号。以下「改正法」という。）が全面施行されることを受け、実務に従事する地方公共団体及び事業者の方が改正法に基づく調査及び措置を行うに当たって参考となる手引きとして、「土壌汚染対策法に基づく調査及び措置に関するガイドライン（改訂第３版）」を作成しました。このガイドラインは今後も内容の一層の充実を図っていくこととしています。. 環境省. 平成 31 年３月水・大気環境局土壌環境課. 本ガイドライン内における記述方法について本ガイドラインでは、法、施行令、施行規則、省令、告示、通知の内容を標準字体で記述し、それらの内容の詳細な説明及び補足事項を斜字体で記述している。.

(3) 目次. 土壌汚染対策法の概要 .................................................................................... 1 土壌汚染対策法の目的 ......................................................................................................... 1 土壌汚染対策法の目的 ···························································································1 法改正の経緯及び目的 ···························································································2 改正法の施行まで及び施行後の経緯 ·········································································4 測定対象とする土壌 ······························································································6 特定有害物質 ....................................................................................................................... 6 自然由来及び水面埋立て土砂由来の土壌汚染の取扱い ........................................................ 9 自然由来で特定有害物質により汚染された土壌の取扱いの基本的な考え方 ······················9 自然由来の有害物質が含まれる汚染土壌により盛土又は埋め戻しが行われた場合の取扱い ······················································································································· 10 形質変更時要届出区域であって当該形質変更時要届出区域内の土地の土壌の特定有害物質による汚染状態が専ら自然に由来すると認められるもの（自然由来特例区域）の該当性について ···················································································································· 11 公有水面埋立地における特定有害物質で汚染された土壌の取扱いの基本的な考え方 ········ 11 形質変更時要届出区域であって当該形質変更時要届出区域内の土地の土壌の特定有害物質による汚染状態が水面埋立てに用いられた土砂に由来すると認められるものであって一定の条件を満たすもの（埋立地特例区域）の該当性について ··············································· 12 要措置区域の指定に係る基準 ............................................................................................ 12 汚染状態に関する基準 ························································································· 12 健康被害が生じるおそれに関する基準 ···································································· 14 土壌汚染状況調査 .............................................................................................................. 17 使用が廃止された有害物質使用特定施設に係る工場又は事業場の敷地であった土地の調査 ······················································································································· 19 土壌汚染のおそれがある土地の形質の変更が行われる場合の調査 ································ 37 土壌汚染による健康被害が生ずるおそれがある土地の調査 ········································· 51 区域の指定等 ..................................................................................................................... 56 要措置区域 ········································································································ 56 形質変更時要届出区域 ························································································· 82 指定の申請 ...................................................................................................................... 102 趣旨 ··············································································································· 102 指定の申請の手続 ····························································································· 102 台帳 ................................................................................................................................. 104 指定台帳の調製 ································································································ 104.

(4) 指定台帳の訂正及び消除 ···················································································· 107 解除台帳の調製 ································································································ 108 解除台帳の訂正 ································································································ 110 台帳の保管及び閲覧 ·························································································· 110 汚染土壌の搬出等に係る規制 .......................................................................................... 110 汚染土壌の搬出時の措置 ···················································································· 110 汚染土壌処理業 ································································································ 128 その他 ............................................................................................................................. 130 指定調査機関 ··································································································· 130 指定支援法人 ··································································································· 140 都道府県知事による土壌汚染に関する情報の収集、整理、保存及び提供等 ·················· 141 有害物質使用特定施設を設置していた者による土壌汚染状況調査への協力 ·················· 142 法の規定に基づく命令（政省令）の制定等における経過措置 ···································· 143 権限の委任 ······································································································ 143 政令で定める市の長による事務の処理 ·································································· 143 罰則 ··············································································································· 143 改正法等の施行に伴う経過措置 ··········································································· 143 法の施行に当たっての配慮事項等 ········································································ 144. 土壌汚染状況調査 ....................................................................................... 146 土壌汚染状況調査の契機（法第３条～第５条） .............................................................. 146 基本的な考え方 ································································································ 146 法第３条第１項本文調査（調査義務） ·································································· 146 法第３条第８項調査（調査命令） ········································································ 147 法第４条第２項及び第３項調査（調査命令） ························································· 147 法第５条調査（調査命令） ················································································· 148 土壌汚染状況調査の対象地の範囲（法第３条～第５条） ................................................ 149 法第３条第１項調査（調査義務） ········································································ 149 法第３条第８項調査（調査命令） ········································································ 149 法第４条第３項調査（調査命令） ········································································ 150 法第５条調査（調査命令） ················································································· 150 土壌汚染状況調査の対象地の土壌汚染のおそれの把握等（地歴調査） ........................... 150 情報の入手・把握 ····························································································· 152 試料採取等対象物質の種類の選定 ········································································ 168 汚染のおそれの由来に応じた区分 ········································································ 172 土壌汚染状況調査の対象地の土壌汚染のおそれの把握等の省略（規則第 11 条） ·········· 177 人為等に由来する汚染のおそれがある土地における土壌汚染のおそれの区分の分類 ...... 177 土壌汚染のおそれの区分の分類の実施 ·································································· 177 2.4.2. 汚染のおそれが生じた場所の位置に関する情報の記録 ··············································· 189.

(5) 2.4.3. 複数の工場又は事業場の立地履歴が認められた場合 ·················································· 190 人為等由来汚染調査における試料採取等を行う区画の選定 ............................................. 192 単位区画及び 30ｍ格子の区分 ············································································· 192 試料採取等区画の選定 ······················································································· 200 汚染のおそれが生じた場所の位置に関する情報の整理 ············································· 209 規則第４条第４項の規定により試料採取等の対象としないことができる単位区画の考え方 ····················································································································· 212 試料採取等を行う区画の選定等の省略 ·································································· 219 人為等由来汚染調査における試料採取等の実施 .............................................................. 220 調査対象物質の種類ごとに行うべき試料採取等の種類 ············································· 220 第一種特定有害物質（揮発性有機化合物）に関する試料採取等 ································· 221 第二種特定有害物質（重金属等）及び第三種特定有害物質（農薬等）に関する試料採取等 ····················································································································· 244 法第５条第１項の命令の場合の特例 ····································································· 256 人為等由来汚染調査の結果の評価 ................................................................................... 263 人為等由来による汚染の有無の評価 ····································································· 263 人為等由来による土壌汚染の範囲の評価 ······························································· 263 人為等由来による土壌の汚染状態の評価 ······························································· 264 自然由来汚染調査 ............................................................................................................ 285 調査対象地の区画の設定 ···················································································· 285 試料採取等を行う区画の選定 ·············································································· 286 試料採取等 ······································································································ 293 自然由来汚染調査の結果の評価 ··········································································· 305 水面埋立て土砂由来汚染調査 .......................................................................................... 313 試料採取等を行う区画の選定 ·············································································· 313 試料採取等 ······································································································ 317 水面埋立て土砂由来汚染調査結果の評価 ······························································· 325 土壌汚染状況調査の結果の評価と報告 ............................................................................ 330 土壌汚染状況調査の結果の評価 ··········································································· 330 土壌汚染状況調査の報告 ···················································································· 333 土壌汚染状況調査の追完 ................................................................................................. 345 土壌汚染状況調査の省略と追完 ··········································································· 345 土壌汚染状況調査の追完に関する留意事項 ···························································· 348 特例調査及び人為等由来汚染調査以外の省略と追完 ················································ 356 一部区域の追完に関する留意事項 ········································································ 367. 要措置区域等の指定.................................................................................... 368.

(6) 要措置区域等の指定の対象となる土地の区画 .................................................................. 368 要措置区域等の指定に係る基準 ....................................................................................... 368 汚染状態に関する基準 ······················································································· 368 健康被害が生じるおそれに関する基準 ·································································· 368 要措置区域等の指定 ........................................................................................................ 372 要措置区域の指定及びその公示 ··········································································· 374 形質変更時要届出区域の指定 ·············································································· 374 臨海部特例区域の指定 ······················································································· 382 要措置区域等の指定の解除 .............................................................................................. 385 要措置区域の指定の解除 ···················································································· 385 形質変更時要届出区域の指定の解除 ····································································· 386 台帳 ................................................................................................................................. 386 指定台帳の調製 ································································································ 386 指定台帳の訂正及び消除 ···················································································· 387 解除台帳の調製 ································································································ 387 解除台帳の訂正 ································································································ 388 台帳の保管及び閲覧 ·························································································· 388. 指定の申請 .................................................................................................. 389 趣旨 ................................................................................................................................. 389 指定の申請の手続 ............................................................................................................ 389 都道府県知事による審査 ................................................................................................. 390 区域の指定 ...................................................................................................................... 391 その他 ............................................................................................................................. 392 汚染の除去等の措置の実施にともなう土壌汚染の拡散が見込まれる土地の区域についての指定の申請の活用 ································································································ 392 試料採取等を行う深さを限定して試料採取等を行った土地での汚染の除去等の措置の実施にともなう指定の申請の活用 ················································································· 392 汚染の除去等の措置を実施した範囲について汚染状況を調査して土壌汚染が明らかとなった場合の指定の申請の活用 ···················································································· 393 試料採取等を行う深さを限定して試料採取等を行い要措置区域等に指定された土地での土地の形質の変更の実施にともなう指定の申請の活用 ··················································· 394 形質変更時要届出区域に指定されていない土地について、法第 14 条の指定の申請とともに施行管理方針の確認の申請の手続を行う場合の指定の申請 ······································· 395.